JPH10226827A - Method for melting metallic cutting powder and melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melting furnace for metallic cutting powder continuously and efficiently melting a large quantity thereof into good quality and in good melting yield in the small capacity melting furnace. SOLUTION: The melting furnace is provided with a melting chamber 8 for storing molten metal 2 heated and melted with the induction heating coil 1, a cylinder body 4 penetrating a reference bath surface E so as to pass through from the upper part to the lower part of the reference bath surface E in the melting chamber 8, and leaned toward the peripheral wall 3a of the furnace body 3 in the melting chamber 8, a charging means A for charging the metallic cutting powder R into the cylinder body 4 and stirring vane 9 arranged in the cylinder body 4 and mechanically stirring the molten metal 2 in the cylinder body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a melting furnace for dissolving metal cutting powder which is a waste material such as aluminum alloy.

[0002]

2. Description of the Related Art Conventionally, in order to dissolve relatively fine particles such as metal cutting powder, a reflection type melting furnace using heavy oil or gas has been used.

[0003]

However, an increase in room temperature due to exhaust gas or exhaust heat has led to a deterioration in the workplace environment. In addition, since a large-scale device is used, a large space for installing the device is required, and since it takes a long time to start operation, heating efficiency is poor and energy loss is large. Furthermore, in terms of performance, oxides, hydrogen gas, and the like are often involved in the molten metal, resulting in poor quality.

Accordingly, the present invention has been made to solve the above-mentioned disadvantages, and to provide a method and a melting furnace for melting metal cutting powder in which a large amount of metal cutting powder can be continuously and efficiently produced in a small melting furnace with a high melting efficiency. The purpose is to:

[0005]

According to the present invention, there is provided a method for melting metal cutting powder, wherein a horizontal area of the molten metal which is heated and melted by an induction heating coil is smaller than a horizontal area of the molten chamber. The cylindrical body penetrates the reference liquid level so as to extend from above to below the reference liquid level of the molten metal in the melting chamber, and is unevenly distributed near the peripheral wall of the furnace main body in the melting chamber,
In addition, the liquid level of the molten metal in the cylindrical body is made into a mortar shape by rotating a stirring blade, metal cutting powder is poured into the mortar-shaped liquid surface, and the metal cutting powder is melted by a vortex generated by the stirring blade. Force sink inside.

[0006] The melting furnace for the metal cutting powder has a melting chamber in which the molten metal heated and melted by the induction heating coil is stored, and the reference liquid level penetrates from above to below the reference liquid level in the melting chamber. A cylindrical body unevenly distributed near the peripheral wall of the furnace main body in the melting chamber, a charging unit for charging metal cutting powder into the cylindrical body, and mechanically stirring the molten metal in the cylindrical body provided in the cylindrical body. A stirring blade.

In addition, a melting chamber in which the molten metal heated and melted by the induction heating coil is stored, and the reference liquid level is penetrated so as to extend from above to below the reference liquid level in the melting chamber, and is unevenly distributed near the peripheral wall of the furnace body. A cylindrical body, a charging means for charging metal cutting powder into the cylindrical body, and a stirring blade provided in the cylindrical body for mechanically stirring the molten metal in the cylindrical body. A smoke exhaust means for exhausting smoke generated when metal cutting powder is introduced is provided above the metal powder.

Further, even if the stirring blade is disposed near the lower opening of the cylindrical body, the smoke exhaust means has a smoke exhaust guiding cylinder for discharging smoke, and rotates the stirring blade. A nozzle communicating with the exhaust hole of the air motor may be attached to the cylinder so as to face the smoke discharge direction.

[0009]

1 and 2 show an embodiment of a melting furnace according to the present invention. The melting furnace has a cylindrical furnace body 3, and the furnace body 3 is made of metal. A melting chamber 8 in which the molten metal 2 in which the cutting powder R is melted by heating is stored, and a peripheral wall 3a of the furnace body 3 is formed by penetrating the reference liquid level E from above to below the reference liquid level E in the melting chamber 8. And a cylindrical body 4 formed integrally. The reference liquid level E is a liquid volume at the time of the most efficient dissolution, and has a depth H when the liquid is stopped.

More specifically, the melting chamber 8 is surrounded by a peripheral wall 3a and a bottom wall 3b of the furnace body 3 lined with a refractory material such as a fire-resistant heat insulating brick, and a refractory material is lined at an opening. A lid 17 is attached. A spiral induction heating coil 1 for heating and melting the metal cutting powder R is provided inside the peripheral wall 3a along the peripheral wall 3a.

The cylindrical body 4 is unevenly distributed near the peripheral wall 3 a of the furnace main body 3, and has a horizontal area smaller than the horizontal area of the melting chamber 8. An air motor 5 is provided above the cylindrical body 4, and the air motor 5 is held by a cylindrical holding member 6. The holding member 6 is supported by a support member 18 provided on the upper opening 4a.

When the air motor 5 is driven, air is sent from above the holding member 6 in the direction of arrow J to rotate the air motor 5. Thereafter, the air used for rotation is exhausted from the exhaust hole 14 in the direction of arrow Q.

A vertical rotation shaft 7 is rotatably mounted on the air motor 5. Further, a stirring blade 9 is attached to a lower end of the vertical rotation shaft 7. The stirring blade 9 is disposed near the lower opening 4 b of the cylindrical body 4. The entire blade 9 always sinks below the liquid level F of the molten metal 2.

In this melting furnace, charging means A for charging the metal cutting powder R to the cylindrical body 4, tapping means B for discharging the molten metal 2 in the melting chamber 8, and metal cutting powder R are charged. And smoke discharging means C for discharging smoke G generated at the time.

More specifically, the charging means A includes a hopper (not shown) for storing the metal cutting powder R, a screw conveyor for feeding the metal cutting powder R, and the like, and as shown in FIG. , And a chute section 10 into which metal cutting powders R are fed. Moreover, the tip 10a of the chute 10 is formed integrally with the support member 18 provided on the upper opening 4a of the cylindrical body 4 so that the metal cutting powder R can be reliably injected into the cylindrical body 4. To

As shown in FIGS. 1 to 3, the tapping means B communicates with a groove 11 having a cross shape in a plan view provided at the upper end of the peripheral wall 3 a of the furnace body 3. And a discharge portion 12 integrally formed with the peripheral wall 3a. Also, this groove 11
Is provided with a weir portion 16 for adjusting hot water supply.
The weir portion 16 is attached to an air cylinder 19, and the tapping of the hot water is adjusted by the vertical movement of the weir portion 16 by the air cylinder 19.

Further, as shown in FIG.
Has a smoke exhaust guide section 13 for discharging smoke G. The lower part of the guide cylinder 13 communicates with the chute 10. Further, an exhaust hole 14 of the air motor 5 is connected to the cylinder 13 via a hose 21. In addition, a nozzle 15 is attached to the end of the hose 21 and is inserted into the cylindrical portion 13 so as to face the smoke discharge direction K. The smoke G guided through the cylindrical portion 13 is discharged in the smoke discharge direction K by the kinetic energy of the exhaust M from the air motor 5 ejected from the nozzle 15. Although not shown, a nozzle is formed with an L-shaped pipe, and the inside of the cylindrical portion 13 (axial center or its vicinity) is formed.
In this case, it is also preferable to dispose so as to open in the smoke exhaust direction K.

Next, a method for dissolving the metal cutting powders R will be described. First, as shown by a virtual line in FIGS. 1 and 3,
The weir 16 is lowered into the concave groove 11 to prevent the molten metal 2 from flowing out. Next, as shown in FIG. 1, the molten metal 2 is induction-heated by the induction heating coil 1. Thereafter, the vertical rotating shaft 7 is rotated in the direction of arrow D by the air motor 5, whereby the stirring blade 9 attached to the lower end is rotated.

The rotation of the stirring blade 9 causes the molten metal 2 in the cylindrical body 4 to be swirled and agitated, and the liquid level F of the molten metal 2 is formed into a mortar shape as shown by a virtual line. Then, when metal cutting powders R... Are injected into the mortar-shaped liquid surface F in the direction of arrow Y by the above-described input means A, first, the metal cutting powders R.
However, as soon as the surface of the high-temperature molten metal 2 is touched, cutting oil or the like adhering to the surface is generated as smoke G. This smoke G
Is guided into the smoke exhaust cylinder 13 and the above-described smoke exhaust means C
As a result, the gas is discharged in the smoke discharge direction K.

As shown in FIG. 4, as soon as the metal cutting powder R is dropped onto the upper surface of the molten metal 2 by the vortex L generated by the stirring blade 9, it is forced into the molten metal 2 immediately. Submerged. The molten metal 2 stored in the melting chamber 8 forms a raised liquid surface P by the stirring force generated by the induction heating coil 1, and a plurality of vortices S are generated inside. Moreover, since the molten metal 2 in the melting chamber 8 is circulated in the melting chamber 8 by the vortex S ..., the temperature is uniformly maintained at a high temperature.

Accordingly, the metal cutting powder R which is intermittently or continuously supplied is constantly circulated and dissolved by the vortex L generated by the stirring blade 9 and the plurality of vortices S described above. When the molten metal 2 is discharged, as shown by a solid line in FIG. 1, the weir portion 16 is moved upward (by the air cylinder 19) to discharge a desired amount of the molten metal 2.

Although not shown, the end of the induction heating coil 1 is connected to a high-frequency power supply, and is rapidly heated by flowing a high-frequency current. Further, as shown in FIG. 4, overheating of the coil 1 can be prevented by causing the cooling water W to spirally flow down the inside of the coil 1 from the upper end of the coil 1 and discharge it from the lower end. .

The present invention can be freely modified in design other than the above-described embodiment. For example, in the melting chamber 8, the cylindrical body 4
May be provided in plurality. The tapping means B is provided in the furnace main body 3.
A tap hole may be formed in the peripheral wall 3a, or the furnace body 3 may be tilted as a whole to discharge the tap water.

[0024]

According to the present invention, the following significant effects can be obtained by the above configuration.

According to the first aspect of the present invention, since the metal cutting powders R are supplied while the liquid level F in the cylindrical body 4 is in a mortar shape, the metal cutting powders R are dropped while the cylindrical body 4 is falling. Molten melt 2
Can be wrapped quickly.

Further, the vortex L generated by the stirring blade 9 rapidly sinks the metal cutting materials R into the interior of the molten metal 2 and shortens the time required for the metal cutting powder R introduced to float on the liquid surface F of the molten metal 2. From the above, the metal cutting powder R is oxidized,
Since entrainment of hydrogen gas can be prevented, the quality of the molten metal 2 can be improved, and the melting yield can be improved.

[0027] According to the second aspect, the equipment and apparatus for dissolving the metal cutting powder R can be miniaturized. Due to this downsizing, the installation space of the apparatus can be reduced, and the time required for starting the operation of the melting furnace can be shortened, so that melting can be performed with high heating efficiency. Moreover, the cylindrical body 4
Are unevenly distributed near the peripheral wall 3a of the furnace body 3, so that the cylindrical body 4 can be easily supported.

The metal cutting powders R are rapidly sunk into the molten metal 2 by the stirring blades 9 and dissolved therein, so that a high-quality molten metal 2 can be obtained with good yield without being oxidized. Further, the metal cutting powder R can be efficiently and intermittently or continuously introduced, and the amount of molten metal can be increased.

According to the third aspect, in addition to the effect of the second aspect, the provision of the smoke exhaust means C makes it possible to quickly remove the smoke G generated from the metal cutting powder R. In addition to improving the quality of the molten metal 2, the work environment is not deteriorated due to exhaust gas and exhaust heat.

Since the entire stirring blade 9 is submerged below the liquid level F (according to claim 4), the molten metal 2 is surely stirred by the rotation of the blade 9 to generate the vortex L, thereby facilitating easy rotation. The liquid level F can be mortar-shaped. Therefore, the metal cutting powder R can be quickly sunk into the molten metal 2 and the quality of the molten metal 2 can be improved.

According to the fifth aspect, since the smoke G is discharged to the outside by using the exhaust M of the air motor 5, it is possible to quickly discharge the smoke with a compact device and to save energy. .

[Brief description of the drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

FIG. 2 is a plan view.

FIG. 3 is a side view of a main part.

FIG. 4 is an explanatory view showing a dissolving method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction heating coil 2 Melt 3 Furnace main body 3a Peripheral wall 4 Cylindrical body 4b Lower opening 5 Air motor 8 Melting chamber 9 Stirrer blade 13 Smoke exhaust induction cylinder 14 Exhaust hole 15 Nozzle A Injection means C Smoke exhaust means E Reference liquid level F Liquid Surface G Smoke R Metal cutting powder K Smoke emission direction L Eddy current

Claims (5)

[Claims] 1. A cylindrical body 4 having a horizontal area smaller than the horizontal area of a melting chamber 8 is placed in a melting chamber 8 in which a molten metal 2 heated and melted by an induction heating coil 1 is stored. The furnace body 3 is passed through the reference liquid level E of the molten metal 2 so as to extend from above to below the reference liquid level E and into the melting chamber 8.
And the liquid surface F of the molten metal 2 in the cylindrical body 4 is formed into a mortar shape by rotating the stirring blade 9,
Metal cutting powder R ... is poured into the mortar-shaped liquid surface F, and the metal cutting powder R ... is forcibly submerged in the molten metal 2 by a vortex L generated by the stirring blade 9. How to dissolve the powder. 2. A melting chamber 8 in which a molten metal 2 heated and melted by an induction heating coil 1 is stored, and a reference liquid level E is penetrated from above the reference liquid level E in the melting chamber 8 to below. A cylindrical body 4 eccentrically located near the peripheral wall 3a of the furnace main body 3 in the melting chamber 8 and a metal cutting powder R in the cylindrical body 4
And stirring blades 9 provided in the cylindrical body 4 for mechanically stirring the molten metal 2 in the cylindrical body 4.
And a melting furnace for cutting metal powder. 3. A melting chamber 8 in which the molten metal 2 heated and melted by the induction heating coil 1 is stored, and the reference liquid level E is penetrated so as to extend from above to below the reference liquid level E in the melting chamber 8. A cylindrical body 4 unevenly distributed near the peripheral wall 3a of the furnace body 3, a charging means A for charging the metal cutting powder R into the cylindrical body 4, and a cylindrical body 4 provided in the cylindrical body 4; A stirring blade 9 for mechanically stirring the molten metal 2 is provided, and a smoke exhaust means C for discharging smoke G generated when the metal cutting powder R is charged is provided above the melting chamber 8. A melting furnace for cutting metal powder. 4. The stirring blade 9 is provided in the lower opening 4 of the cylindrical body 4.
4. The melting furnace for metal cutting powder according to claim 2, which is disposed near b. 5. A smoke discharge means C having a smoke discharge guide cylinder 13 for discharging smoke G, and a nozzle 15 communicating with an exhaust hole 14 of an air motor 5 for rotating and driving the stirring blade 9. To
The melting furnace for metal cutting powder according to claim 3, wherein the metal cutting powder is attached to the cylindrical portion 13 so as to face the smoke discharge direction K. 5.